The Experts below are selected from a list of 159 Experts worldwide ranked by ideXlab platform
Lanre Oshinowo - One of the best experts on this subject based on the ideXlab platform.
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Computer simulation of mechanical seal leads to design change that improves coolant circulation
Materials & Design, 2002Co-Authors: Ray Clark, Henri Azibert, Lanre OshinowoAbstract:Abstract Engineers at AW Chesterton Co. used computer simulation to improve the design of a mechanical seal and extend the performance limits established through laboratory testing. Using computational Fluid dynamics (CFD) software to simulate the flow of Fluid within the seal, it was determined that the Barrier Fluid, which also functions as a coolant, was not circulating to areas of the seal where heat is generated. A number of design changes were evaluated using CFD as a guide toward improving the axial circulation. Results showed that by tapering the bounding surfaces of the stationary seal rings and the shaft sleeve, axial movement of Barrier Fluid could be improved and heat removal increased by almost 50% compared to the earlier design. This change is now being implemented in some of Chesterton's product line, providing customers with a cooler-running, longer-lasting mechanical seal for centrifugal pumps and mixers. Chesterton is comprised of three business units: Fluids sealing systems; which includes mechanical seals, mechanical packing and gasketing, and process pumps; hydraulic/pneumatic sealing devices; and technical products, which includes maintenance chemicals and ARC component materials. Many of the commonly accepted technologies in Fluid sealing systems have originated in the company's research and development labs, including such industry-changing developments as the original cartridge seals and the first commercial split seal.
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Sealed and delivered
Mechanical Engineering, 1999Co-Authors: Ray Clark, Henri Azibert, Lanre OshinowoAbstract:Engineers at A.W Chesterton Co., Stoneham, MA, applied computational Fluid dynamics (CFD) to a new model of their heavy-duty cartridge dual seal Chesterton's dual seal consists of two pairs of seal rings. Mechanical seals are widely used to prevent leakage from Fluid-handling equipment such as centrifugal pumps and mixers. Outer pair rotates with the shaft; inner pairs are fixed and contain a channel for the Barrier Fluid. The seal confines process Fluids to the areas on the left. Taper is visible along the lower edge of the inner seal rings and on the corresponding surface of the shaft covering. CFD images described in the article depict the axial circulation of the seal's Barrier Fluid for a typical untapered seal design and the improved circulation resulting from the tapered surface design. The change in flow patterns results in an improvement in heat removal, from 0.7 to 1.1 kW. In order to validate the accuracy of the CFD results, physical experiments were conducted in Chesterton's seal test laboratory, using a variety of flow rates, rotation speeds, and Fluids. The seals that do incorporate the innovative design have performed well in the field, operating at cooler temperatures that should result in seal life at least 30 percent longer,
Ray Clark - One of the best experts on this subject based on the ideXlab platform.
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Computer simulation of mechanical seal leads to design change that improves coolant circulation
Materials & Design, 2002Co-Authors: Ray Clark, Henri Azibert, Lanre OshinowoAbstract:Abstract Engineers at AW Chesterton Co. used computer simulation to improve the design of a mechanical seal and extend the performance limits established through laboratory testing. Using computational Fluid dynamics (CFD) software to simulate the flow of Fluid within the seal, it was determined that the Barrier Fluid, which also functions as a coolant, was not circulating to areas of the seal where heat is generated. A number of design changes were evaluated using CFD as a guide toward improving the axial circulation. Results showed that by tapering the bounding surfaces of the stationary seal rings and the shaft sleeve, axial movement of Barrier Fluid could be improved and heat removal increased by almost 50% compared to the earlier design. This change is now being implemented in some of Chesterton's product line, providing customers with a cooler-running, longer-lasting mechanical seal for centrifugal pumps and mixers. Chesterton is comprised of three business units: Fluids sealing systems; which includes mechanical seals, mechanical packing and gasketing, and process pumps; hydraulic/pneumatic sealing devices; and technical products, which includes maintenance chemicals and ARC component materials. Many of the commonly accepted technologies in Fluid sealing systems have originated in the company's research and development labs, including such industry-changing developments as the original cartridge seals and the first commercial split seal.
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Sealed and delivered
Mechanical Engineering, 1999Co-Authors: Ray Clark, Henri Azibert, Lanre OshinowoAbstract:Engineers at A.W Chesterton Co., Stoneham, MA, applied computational Fluid dynamics (CFD) to a new model of their heavy-duty cartridge dual seal Chesterton's dual seal consists of two pairs of seal rings. Mechanical seals are widely used to prevent leakage from Fluid-handling equipment such as centrifugal pumps and mixers. Outer pair rotates with the shaft; inner pairs are fixed and contain a channel for the Barrier Fluid. The seal confines process Fluids to the areas on the left. Taper is visible along the lower edge of the inner seal rings and on the corresponding surface of the shaft covering. CFD images described in the article depict the axial circulation of the seal's Barrier Fluid for a typical untapered seal design and the improved circulation resulting from the tapered surface design. The change in flow patterns results in an improvement in heat removal, from 0.7 to 1.1 kW. In order to validate the accuracy of the CFD results, physical experiments were conducted in Chesterton's seal test laboratory, using a variety of flow rates, rotation speeds, and Fluids. The seals that do incorporate the innovative design have performed well in the field, operating at cooler temperatures that should result in seal life at least 30 percent longer,
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Simulating mechanical seals to improve coolant circulation
World Pumps, 1999Co-Authors: Ray Clark, Henri AzibertAbstract:Abstract Engineers at A W Chesterton used computer simulation to improve the design of a mechanical seal and extend the performance limits established through laboratory testing. Using computational Fluid dynamics (CFD) software to simulate the flow of Fluid within the seal, it was determined that the Barrier Fluid, which also functions as a coolant, was not circulating to areas of the seal where heat is generated.
Muhannad W. Gamal-aldin - One of the best experts on this subject based on the ideXlab platform.
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Integral Pumping Devices for Dual Mechanical Seals: Hydraulic Performance Generalization Using Dimensional Analysis
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2018Co-Authors: H.a. Warda, Ihab G. Adam, A. B. Rashad, Muhannad W. Gamal-aldinAbstract:An experimental study is carried out investigating hydraulic performance for various designs of dual-mechanical-seal cartridges with integral pumping-rings. The tested devices are classified into two main families: radial-flow and axial-flow. The radial-flow family utilizes the modified-paddle-wheel (MPW) pumping ring with either a radial or a tangential oriented cartridge outlet port, while the axial-flow family utilizes the pumping scroll (PS) pumping ring in the following cartridge-geometries: single-pumping-scroll (SS) and double-pumping-scroll (DS); as both types can be of either a radial or a tangential outlet port; and of an internal clearance value complying with American Petroleum Institute (API) 682 standard or smaller clearance. An experimental setup is constructed, and appropriate instrumentation is employed to measure inlet pressure, outlet pressure, rotational speed, and Barrier Fluid flow rate acquiring flow-head characteristic curves. Moreover, empirical generalized characteristic curves are deduced from experimental observations obtained from the present study and previous companion work. The generalized curves can be employed in estimating pumping ring performance for a different size or other operation conditions such as varying rotational speed or Fluid type. They can be also utilized to validate numerical simulations for geometrically similar designs.
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Bi-directional integral pumping devices for dual mechanical seals: Influence of mesh type on accuracy of numerical simulations
Elsevier, 2018Co-Authors: H.a. Warda, A. B. Rashad, Ig Adam, Muhannad W. Gamal-aldinAbstract:A numerical study is conducted to simulate the performance of Barrier Fluid flow through a bi-directional dual mechanical seal with an integral radial pumping ring. Standard K-ε model is implemented as a turbulence model. Multiple Reference Frame approach is implemented to model the rotation of the pumping ring. The present study is a sequel to a previous companion work done in the area of visualization of Barrier Fluid flow. Improvements to the previous work depended on two aspects. First, a multi-block hybrid (tetra, prism and hexa) mesh is used where it is aimed to reduce numerical false diffusion by orienting the cells to be aligned with flow direction as much as possible. Second, expanding model’s boundaries to include inboard sealing faces. The numerical results are validated against Q-ΔP curves produced from experimental tests where an experimental setup is constructed, and appropriate instrumentation is employed to measure the pressure, temperature, and flow rate of the Barrier Fluid.Moreover, implementation of two spatial discretization schemes is illustrated to verify the numerical performance of each method. Second order Upwind and QUICK (Quadratic Upstream Interpolation for Convective Kinematics) schemes are used for the discretization of convective terms. The validity of implementation of each method is investigated since higher-order methods are known to be more computationally expensive but their accuracy are higher. The results by the hybrid mesh indicate that the use of the Second-order scheme provides more accurate prediction of Q-ΔP curves than the previous companion work. Moreover, the impact of using the QUICK scheme is the increased computational time while providing slightly more accurate Q-H curve relative to the second-order scheme.Finally, expanding model’s boundaries to include inboard sealing faces revealed that closed Barrier Fluid circulation takes place in the vicinity of the inboard sealing faces indicating poor renewal of the Barrier Fluid contained within this zone compared to the outboard sealing faces. Keywords: Integral pumping device, Dual mechanical seals, Barrier Fluid flow, Hybrid mesh, CF
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Bi-directional integral pumping devices for dual mechanical seals: Influence of mesh type on accuracy of numerical simulations
Alexandria Engineering Journal, 2018Co-Authors: H.a. Warda, A. B. Rashad, Ig Adam, Muhannad W. Gamal-aldinAbstract:Abstract A numerical study is conducted to simulate the performance of Barrier Fluid flow through a bi-directional dual mechanical seal with an integral radial pumping ring. Standard K- e model is implemented as a turbulence model. Multiple Reference Frame approach is implemented to model the rotation of the pumping ring. The present study is a sequel to a previous companion work done in the area of visualization of Barrier Fluid flow. Improvements to the previous work depended on two aspects. First, a multi-block hybrid (tetra, prism and hexa) mesh is used where it is aimed to reduce numerical false diffusion by orienting the cells to be aligned with flow direction as much as possible. Second, expanding model’s boundaries to include inboard sealing faces. The numerical results are validated against Q- Δ P curves produced from experimental tests where an experimental setup is constructed, and appropriate instrumentation is employed to measure the pressure, temperature, and flow rate of the Barrier Fluid. Moreover, implementation of two spatial discretization schemes is illustrated to verify the numerical performance of each method. Second order Upwind and QUICK (Quadratic Upstream Interpolation for Convective Kinematics) schemes are used for the discretization of convective terms. The validity of implementation of each method is investigated since higher-order methods are known to be more computationally expensive but their accuracy are higher. The results by the hybrid mesh indicate that the use of the Second-order scheme provides more accurate prediction of Q- Δ P curves than the previous companion work. Moreover, the impact of using the QUICK scheme is the increased computational time while providing slightly more accurate Q-H curve relative to the second-order scheme. Finally, expanding model’s boundaries to include inboard sealing faces revealed that closed Barrier Fluid circulation takes place in the vicinity of the inboard sealing faces indicating poor renewal of the Barrier Fluid contained within this zone compared to the outboard sealing faces.
H.a. Warda - One of the best experts on this subject based on the ideXlab platform.
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Integral Pumping Devices for Dual Mechanical Seals: Hydraulic Performance Generalization Using Dimensional Analysis
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2018Co-Authors: H.a. Warda, Ihab G. Adam, A. B. Rashad, Muhannad W. Gamal-aldinAbstract:An experimental study is carried out investigating hydraulic performance for various designs of dual-mechanical-seal cartridges with integral pumping-rings. The tested devices are classified into two main families: radial-flow and axial-flow. The radial-flow family utilizes the modified-paddle-wheel (MPW) pumping ring with either a radial or a tangential oriented cartridge outlet port, while the axial-flow family utilizes the pumping scroll (PS) pumping ring in the following cartridge-geometries: single-pumping-scroll (SS) and double-pumping-scroll (DS); as both types can be of either a radial or a tangential outlet port; and of an internal clearance value complying with American Petroleum Institute (API) 682 standard or smaller clearance. An experimental setup is constructed, and appropriate instrumentation is employed to measure inlet pressure, outlet pressure, rotational speed, and Barrier Fluid flow rate acquiring flow-head characteristic curves. Moreover, empirical generalized characteristic curves are deduced from experimental observations obtained from the present study and previous companion work. The generalized curves can be employed in estimating pumping ring performance for a different size or other operation conditions such as varying rotational speed or Fluid type. They can be also utilized to validate numerical simulations for geometrically similar designs.
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Bi-directional integral pumping devices for dual mechanical seals: Influence of mesh type on accuracy of numerical simulations
Elsevier, 2018Co-Authors: H.a. Warda, A. B. Rashad, Ig Adam, Muhannad W. Gamal-aldinAbstract:A numerical study is conducted to simulate the performance of Barrier Fluid flow through a bi-directional dual mechanical seal with an integral radial pumping ring. Standard K-ε model is implemented as a turbulence model. Multiple Reference Frame approach is implemented to model the rotation of the pumping ring. The present study is a sequel to a previous companion work done in the area of visualization of Barrier Fluid flow. Improvements to the previous work depended on two aspects. First, a multi-block hybrid (tetra, prism and hexa) mesh is used where it is aimed to reduce numerical false diffusion by orienting the cells to be aligned with flow direction as much as possible. Second, expanding model’s boundaries to include inboard sealing faces. The numerical results are validated against Q-ΔP curves produced from experimental tests where an experimental setup is constructed, and appropriate instrumentation is employed to measure the pressure, temperature, and flow rate of the Barrier Fluid.Moreover, implementation of two spatial discretization schemes is illustrated to verify the numerical performance of each method. Second order Upwind and QUICK (Quadratic Upstream Interpolation for Convective Kinematics) schemes are used for the discretization of convective terms. The validity of implementation of each method is investigated since higher-order methods are known to be more computationally expensive but their accuracy are higher. The results by the hybrid mesh indicate that the use of the Second-order scheme provides more accurate prediction of Q-ΔP curves than the previous companion work. Moreover, the impact of using the QUICK scheme is the increased computational time while providing slightly more accurate Q-H curve relative to the second-order scheme.Finally, expanding model’s boundaries to include inboard sealing faces revealed that closed Barrier Fluid circulation takes place in the vicinity of the inboard sealing faces indicating poor renewal of the Barrier Fluid contained within this zone compared to the outboard sealing faces. Keywords: Integral pumping device, Dual mechanical seals, Barrier Fluid flow, Hybrid mesh, CF
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Bi-directional integral pumping devices for dual mechanical seals: Influence of mesh type on accuracy of numerical simulations
Alexandria Engineering Journal, 2018Co-Authors: H.a. Warda, A. B. Rashad, Ig Adam, Muhannad W. Gamal-aldinAbstract:Abstract A numerical study is conducted to simulate the performance of Barrier Fluid flow through a bi-directional dual mechanical seal with an integral radial pumping ring. Standard K- e model is implemented as a turbulence model. Multiple Reference Frame approach is implemented to model the rotation of the pumping ring. The present study is a sequel to a previous companion work done in the area of visualization of Barrier Fluid flow. Improvements to the previous work depended on two aspects. First, a multi-block hybrid (tetra, prism and hexa) mesh is used where it is aimed to reduce numerical false diffusion by orienting the cells to be aligned with flow direction as much as possible. Second, expanding model’s boundaries to include inboard sealing faces. The numerical results are validated against Q- Δ P curves produced from experimental tests where an experimental setup is constructed, and appropriate instrumentation is employed to measure the pressure, temperature, and flow rate of the Barrier Fluid. Moreover, implementation of two spatial discretization schemes is illustrated to verify the numerical performance of each method. Second order Upwind and QUICK (Quadratic Upstream Interpolation for Convective Kinematics) schemes are used for the discretization of convective terms. The validity of implementation of each method is investigated since higher-order methods are known to be more computationally expensive but their accuracy are higher. The results by the hybrid mesh indicate that the use of the Second-order scheme provides more accurate prediction of Q- Δ P curves than the previous companion work. Moreover, the impact of using the QUICK scheme is the increased computational time while providing slightly more accurate Q-H curve relative to the second-order scheme. Finally, expanding model’s boundaries to include inboard sealing faces revealed that closed Barrier Fluid circulation takes place in the vicinity of the inboard sealing faces indicating poor renewal of the Barrier Fluid contained within this zone compared to the outboard sealing faces.
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Effect of Kinematic Viscosity of Barrier Fluids on the Performance of a Bi-Directional Integrated Pumping Ring for Dual Mechanical Seals
Volume 1A Symposia: Turbomachinery Flow Simulation and Optimization; Applications in CFD; Bio-Inspired and Bio-Medical Fluid Mechanics; CFD Verificati, 2016Co-Authors: H.a. Warda, A. B. Rashad, Ig Adam, M. W. Gamal AldinAbstract:An experimental investigation is carried out to evaluate the performance of bi-directional pumping ring for dual mechanical seals. An experimental setup is constructed, and appropriate instrumentation are employed to measure the pressure, temperature, and flow rate of the Barrier Fluid. The experimental study focused on the influence of the kinematic viscosity of the Barrier Fluid on the performance of the pumping ring. This is done by monitoring Q-ΔP curves for various Barrier Fluids and temperature ranges. The tests are conducted for industrial Barrier Fluid compositions which are recommended by vendors of dual mechanical seals, such as Propylene Glycol-water mixtures and Diesel fuel (Grade D2). Despite the importance of the measured performance curves for process control purposes, indicated experimental curved are generalized so that they can be employed in prediction of pumping ring performance for different sizes and operational conditions. Moreover, they can be utilized for numerical models validation.
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Integral Pumping Devices for Dual Mechanical Seals: Experiments and Numerical Simulations
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2014Co-Authors: H.a. Warda, E. M. Wahba, E. A. SelimAbstract:An experimental and numerical investigation is carried out to evaluate the performance of alternative pumping ring designs for dual mechanical seals. Both radial-flow and axial-flow pumping rings are considered in the present study. An experimental setup is constructed, and appropriate instrumentation are employed to measure the pressure, temperature, and flow rate of the Barrier Fluid. A parametric study is carried out to investigate the effect of pump rotational speed, Barrier Fluid accumulator pressure, and Barrier Fluid inlet temperature on the performance of the pumping rings. Experiments are also used to evaluate the effect of different geometric parameters such as the radial clearance between the pumping ring and the surrounding gland, and the outlet port orientation. Moreover, a numerical study is conducted to simulate the flow field for the radial pumping ring designs under different operating parameters. The computational Fluid dynamics (CFD) model implements a multiple reference frame (MRF) technique, while turbulence is modeled using the standard k-epsilon model. Numerical simulations are also used to visualize the flow of the Barrier Fluid within the dual seal cavity. Present results indicate that the pump rotational speed and the orientation of the outlet port have a significant effect on the performance of the pumping ring. On the other hand, the effects of Barrier Fluid accumulator pressure and inlet temperature are minimal on the performance. The study also shows that reducing the radial clearance between the rotating ring and the stationary outer gland would significantly improve the performance of axial pumping rings. Moreover, comparisons between the computational and experimental results show good agreement for pumping ring configurations with tangential outlet (TO) ports and at moderate rotational speeds.
Henri Azibert - One of the best experts on this subject based on the ideXlab platform.
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Computer simulation of mechanical seal leads to design change that improves coolant circulation
Materials & Design, 2002Co-Authors: Ray Clark, Henri Azibert, Lanre OshinowoAbstract:Abstract Engineers at AW Chesterton Co. used computer simulation to improve the design of a mechanical seal and extend the performance limits established through laboratory testing. Using computational Fluid dynamics (CFD) software to simulate the flow of Fluid within the seal, it was determined that the Barrier Fluid, which also functions as a coolant, was not circulating to areas of the seal where heat is generated. A number of design changes were evaluated using CFD as a guide toward improving the axial circulation. Results showed that by tapering the bounding surfaces of the stationary seal rings and the shaft sleeve, axial movement of Barrier Fluid could be improved and heat removal increased by almost 50% compared to the earlier design. This change is now being implemented in some of Chesterton's product line, providing customers with a cooler-running, longer-lasting mechanical seal for centrifugal pumps and mixers. Chesterton is comprised of three business units: Fluids sealing systems; which includes mechanical seals, mechanical packing and gasketing, and process pumps; hydraulic/pneumatic sealing devices; and technical products, which includes maintenance chemicals and ARC component materials. Many of the commonly accepted technologies in Fluid sealing systems have originated in the company's research and development labs, including such industry-changing developments as the original cartridge seals and the first commercial split seal.
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Sealed and delivered
Mechanical Engineering, 1999Co-Authors: Ray Clark, Henri Azibert, Lanre OshinowoAbstract:Engineers at A.W Chesterton Co., Stoneham, MA, applied computational Fluid dynamics (CFD) to a new model of their heavy-duty cartridge dual seal Chesterton's dual seal consists of two pairs of seal rings. Mechanical seals are widely used to prevent leakage from Fluid-handling equipment such as centrifugal pumps and mixers. Outer pair rotates with the shaft; inner pairs are fixed and contain a channel for the Barrier Fluid. The seal confines process Fluids to the areas on the left. Taper is visible along the lower edge of the inner seal rings and on the corresponding surface of the shaft covering. CFD images described in the article depict the axial circulation of the seal's Barrier Fluid for a typical untapered seal design and the improved circulation resulting from the tapered surface design. The change in flow patterns results in an improvement in heat removal, from 0.7 to 1.1 kW. In order to validate the accuracy of the CFD results, physical experiments were conducted in Chesterton's seal test laboratory, using a variety of flow rates, rotation speeds, and Fluids. The seals that do incorporate the innovative design have performed well in the field, operating at cooler temperatures that should result in seal life at least 30 percent longer,
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Simulating mechanical seals to improve coolant circulation
World Pumps, 1999Co-Authors: Ray Clark, Henri AzibertAbstract:Abstract Engineers at A W Chesterton used computer simulation to improve the design of a mechanical seal and extend the performance limits established through laboratory testing. Using computational Fluid dynamics (CFD) software to simulate the flow of Fluid within the seal, it was determined that the Barrier Fluid, which also functions as a coolant, was not circulating to areas of the seal where heat is generated.
